Chronopolis
Chronopolis was a city created by the Valeyard. After gaining immortality, the Valeyard crafted a city within the Time Vortex around his TARDIS, which protected it from harm. He placed a sample of every extinct species within. Chronopolis looked different to every viewer. The Valeyard saw it as the Doctor's ancestral home. (AUDIO: He Jests at Scars...)
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